EP 1709728 A2 20061011 - CLOCK-DATA RECOVERY (CDR) CIRCUIT, APPARATUS AND METHOD FOR VARIABLE FREQUENCY DATA
Title (en)
CLOCK-DATA RECOVERY (CDR) CIRCUIT, APPARATUS AND METHOD FOR VARIABLE FREQUENCY DATA
Title (de)
TAKTDATENWIEDERHERSTELLUNGS-(CDR-)SCHALTUNG, VORRICHTUNG UND VERFAHREN FÜR FREQUENZVARIABLE DATEN
Title (fr)
CIRCUIT, APPAREIL ET PROCEDE DE RECUPERATION DE DONNEES DE D'HORLOGE POUR DONNEES A FREQUENCE VARIABLE
Publication
Application
Priority
- US 2004031784 W 20040928
- US 67502703 A 20030930
Abstract (en)
[origin: US2005069071A1] A circuit, such as a CDR circuit, includes a sampler to receive a data signal having a variable data bit-rate responsive to a clock signal in an embodiment of the present invention. A clock circuit is coupled to the sampler and generates the clock signal responsive to a selectable update rate and a selectable phase adjust step-size. In a second embodiment of the present invention, the clock circuit includes a Stall logic that is coupled to first, second and third stages and is capable to hold the phase adjust signal responsive to the first and second stage output signals. In a third embodiment of the present invention, an indicator detects the variable data bit-rate and a counter provides the selectable phase adjust step-size for the adjust signal. In a fourth embodiment of the present invention, the clock circuit includes the Stall logic, the indicator and the counter. In a fifth embodiment of the present invention, the clock circuit includes an Averaging circuit to output a phase adjust signal responsive to the averaging of a first and second adjust signals for a predetermined period of time.
IPC 8 full level
H03D 3/24 (2006.01); H03L 7/06 (2006.01); H03L 7/081 (2006.01); H03L 7/091 (2006.01); H04L 7/033 (2006.01)
CPC (source: EP US)
H03L 7/0814 (2013.01 - EP US); H03L 7/091 (2013.01 - EP US); H04L 7/0331 (2013.01 - EP US)
Citation (search report)
See references of WO 2005034355A2
Designated contracting state (EPC)
DE GB IT
DOCDB simple family (publication)
US 2005069071 A1 20050331; US 7668271 B2 20100223; DE 202004020988 U1 20060608; EP 1709728 A2 20061011; JP 2007520913 A 20070726; US 2010150290 A1 20100617; US 8130891 B2 20120306; WO 2005034355 A2 20050414; WO 2005034355 A3 20060817
DOCDB simple family (application)
US 67502703 A 20030930; DE 202004020988 U 20040928; EP 04785191 A 20040928; JP 2006534013 A 20040928; US 2004031784 W 20040928; US 71025010 A 20100222